Method of closing and sealing conical paper receptacles



Jan. 20, 1931. H. L. KOLLMAR 1,789,442

METHOD OF CLOSING AND SEALING CONICAL PAPER RECEPTACLES Filed July 6, 1928 INVENTOR Herman .Aollmdr OR EY Patented Jan. 20, 1931 marginal portions UNITED STATES PATENT OFFICE HERMAN L. KOLLMAR, OF NEW YORK, N. Y., ASSIGNOR, BY ME SNE YORK, N. Y., A CORPORATION OF SEALGONES, me, or NEW ASSIGNMENTS, '10 DELAWARE METHOD OF CLOSING AND SEALING CON ICAL PAPER RECEPTACLES Application and July s, 1928. Serial No. 290,727.

This invention relates to receptacles particularly of truncated conical form although it may be made of cylindrical form made of pliable material, such as paper paraffined, with the opening thereto at the smaller end, and to receptacles of this character wherein the receptacle body is made by forming a blank to tubular form and securing the rolled blank at the longitudinal marginal portions, as by an adhesive applied to the overlapped marginal portions, or by a strip adhesively applied to said longitudinal marginal portions, and then permanently securing a closure of relatively stifl material inthe larger end to constitute the bottom. In the closing of receptacles of this character the open end is collapsed by squeezing together the opposite wall portions at the open end of the receptacle and securing said end in such collapsed condi'tion. It has heretofore been the practice to collapse the receptacle in closing the same with the seam at which the blank forming the receptacle body is secured positioned midway between the sides of the receptacle end. By this method of closing the receptacle as the end of the receptacle is collapsed the wall of the receptacle body is distorted, due to the setting up of forces resisting the collapsing of the receptacle end, with the result that forces are set up which exert a strain or stress on the marginal portions which spread or separate the inner portion of the overlapped of the receptacle blank from the outer overlapped portion, permitting the contents of the receptacle, liquid, to come in contact with the adhesive moistening the same and the pressure of the liquid in the receptacle open-s the seam with a consequent leakage of the receptacle. When the overlapped marginal portions of the receptacle blank are secured by a strip adhesively applied thereto there is no adhesive applied to said overlapped portions the surfaces of which are in contact with the result that by the collapsing of the receptacle end the inner ptirtionspreads from the outer lapped portion permitting the liquid to come into contact with the securing adhesive of the strip moistening the same with a consequent pulling away of the securing strip and leakage.

- whereby the forces It is the object of the present invention to provide an improved method of collapsing the receptacle end set up in the wall of the receptacle to the collapsing thereof will distort the receptacle wall in such a manner as to cause the stresses of said forces to be exerted on the overlapped marginal portions of the receptacle blank in a direction toward each other and maintain the marginal portions in firm contact when overlapped, and when a securing strip is applied thereto exert forces thereon to maintain the strip in firm contact with said overlapped portions, and thus 0bviate a spreading and separating of the overlapped marginal portions from each other or from the securing strip.

In the drawing accompanying and forming a part of this application Figure 1- is a side elevation of a receptacle showing an embodiment and arrangement of receptacle structure to which the present invention applies.

Figure 2 is a cross sectional view taken on the line 2-2 of Figure 1 looking in the direction of the arrows.

Figure 3 is a perspective view of the receptacle and showing my improved method of collapsing or squeezing together the open end to close the same; and I Figure .4 is a perspective view of the upper end portion of the receptacle showing the same collapsed and means applied thereto to retain the receptacle end tion and seal the same, the receptacle being partly broken away to show the position the overlapped marginal portions of the receptacle blank will assume when the receptacle is closed by my improved method.

The embodiment of the receptacle illustrated comprises a. body 5 of truncated eonical shape formed bywrapping or folding a suitably shaped blank of paper around a mandrel or horn and secured at the longitudinal marginal portions. As illustrated the one marginal portion Got the blank is lapped over the other longitudinal marginal portion, as shown at 7. and secured and sealed by a strip 8 of suitable material, such as paper, adhesively applied to the overlapped longitudinal marginal portions of the blank in closing the receptacle.

in collapsed condiv the receptacle face of the portion 6 on the mandrel, the adhesive portion of the strip contacting with'the lapped over margina-l portion 6 and with the blank within the marginal portion 7, and beyond the edge of the lapped over portion 6, the adhesive contacting portion of the strip for illustrative purposes having been indicated by sti pling at 6 and 7 in Figure 1. Instead oFoverlapping the portion 6 with the portion 7 of the blank the longitudinal edges may be in abutting relation and the securing and sealing strip applied over of the abutting edges,

or the blank may be secured by adhesive applied to the inner surand the outer surface of theportion 7, in which case the securing and sealing strip 8 is not utilized. The larger end of the receptacle body is permanently closed by engaging a flanged disk 9 of rela tively stifl material in said end with the flange extending outward in contiguous relation with the end portion of the formed receptacle body and suitably secured therein, as at 10, preferably by folding inwardly into interlocking engagement the contiguous disk flange and receptacle portion, and forced into intimate contact by a 'calendering action of rollers, this being effected by what is commonly termed spinning. The receptacle so constructed is subjected to a paraifin bath.

In the prior method of collapsing the open end of the receptacle to close the same the end was collapsed with the connecting portions 6, 7 and 8 of the receptacle positioned intermediate the sides of the receptacle, as shown in Figures 1 and 2, when said end is collapsed, as by compressing or pressing together the opposite wall portions of the receptacle end, and a metallic member formed to V shape in cross section isengaged over and clamped to the pressed together wall portions, as shown at 11 in Figure 4. In this method of closing body intermediate the topand bottom is variably distorted due to the resistance of the receptacle wall to collapse the same'and setting up strains and stresses which exert forces on the overlapped marginal portions of the receptacle body which spread and separate the portion 7 from the overlapped portion 6, as shown in dotted lines in Figure 2, forming an access for the liquid in the receptacle to the space between the portions 6 and 7. The sur face between the parts 6, 7 being in contact in the uncollapsed condition of the receptacle, and in which condition it is subjected to a parafiine bath, the parafline will not permeate to such surfaces and the parafiine coating at the joint being when the receptacle is collapsed broken the liquid permeates to the adhesively connected surfaces between the securing strip and the portions 7. 8 moistening the adhesive with the result that the securing strip is released and there is leakage of the contents from the receptacle.

the marginal portions.

the portion of the receptacle By the present method of closing the receptacle end the distorting forces set up in the receptacle wall, due to, the collapsing of the receptacle end, are exerted in a direction to force the portions 6 and 7 toward each other and cause the securing strip to exert a force in adirection toward the receptacle portion 7", and through the latter to the part 7 to maintain it 1n intimate contact with the part 6 with the result that there is no tendency of the parts 6, 7 spreading and separating or to pull away from the securing strip 8 and a consequent rupturing of the parafline coating at the seam. To cause such a distribution of thestresses and strains due to the collapsing of the receptacle end to effect this result the receptacle end is pressed together so that the edge ofthe portion 7 at the opening to the receptacle is in line or abutting relation with the fold at the one end of the receptacle, as shown in Figures 3 and 4, and the one edge 8 of the securing strip is parallel with the fold or bend of the receptacle at said end, and such edge of the securing strip extendin in a substantially straight line for the ful length of the receptacle, thus efiecting a spiral form of the strip in the longitudinal direction thereof when the receptacle is collapsed, as shown in Figure 3,

exert a force in a direction toward themceptacle, which in turn exerts a-f0rce upon the rtion 7 in a direction toward the portion 6 and thus holding the portions 6, 7 in firm contact with each other, and the strip in firm contact with said portions. When the a open end has been pressed together the member 11 is engaged over and clamped to the collapsed receptacle end to retain it in closed condition and seal thesame.

Having thus described my invention I claim: w

1. The method of closing the open end of receptacles embodying a cylindrical truncated body formed of a blank shaped to and secured in tubular form by a strip adhesively secured over the longitudinal marginal portions of the blank and having a relatively stifi closure secured in the larger end and open at the smaller end, consisting in collapsing the open end of the receptacle by squeezing together the opposite wall portions at the openreceptacle end with the end of the securing strip at the open end positioned at one side of the receptacle when collapsed, and setting up stresses in the receptacle resisting the collapsing of the receptacle end the forces of which are exerted on the longitudinal marginal portions of the receptacle blank and securing strip in a direction toward each other and maintain said portions and the strip in firm contact when the receptacle end is in collapsed condition.

2. In the method of closing the open end of receptacles as claimed in claim 1, wherein the securing strip is positioned so that a longitudinal edge of the securing strip is in line with the fold at the one end of the collapsed receptacle end when the receptacleend is in collapsed condition, and securing the receptacle end in collapsed condition.

3. The method of closing and sealing the open end of receptacles embodying a cylindrical body formed from a. blank shaped to tubular form and secured together at the longitudinal marginal portions with one longitudinal marginal portion of the blank in overlapped relation to the other longitudinal marginal portion of the blank and having a relatively stiff disk secured in one end. and open at ,the opposite end, consisting in collapsing the open end of the receptacle by squeezing together the opposite wall portions at the open receptacle end with the edge of the inner of the lapped marginal portions of the receptacle blank positioned in line with the fold at one end of the collapsed receptacle end, and then securing the collapsed receptacle end in such condition.

4. The method of closing and sealing the open end of a receptacle as claimed in claim 3, wherein the receptacle blank is secured by a strip adhesively applied over the lapped marginal portions of the blank, and said strip positioned with one longitudinal edge extending in a plane parallel with the edge of the inner of the lapped marginal portions of the receptacle blank and in line with the fold at one end of the receptacle end when the receptacle end is in collapsed condition.

Signed at the city of New York, in the county of New York, and State of New York, this 2d day of July A. D. 1928.

HERMAN L. KOLLMAR- 

